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14. which statement is true? a melting point and boiling point tend to increase with molecular weight b. melting point and boiling point tend to decrease with molecular weight c molecular weight does not influence the boiling point and melting point of substance. d. all of the above 15. which of the following forms hydrogen bonds? a. HCI C. Has b. HF d. H2Se 16. which statement is true? a. when water condenses, it absorbs heat energy b. melting point is the temperature when water freezes. c. running water may break up rocks by dissolving their soluble minerals. d. all of the above 17. the highest density of water (1 g/mL) occurs at a. O degrees C c. 20 degrees C b. 4 degrees C d. 100 degrees C 18. which of the following is a polar compound? a. Cl2 C. HCI b. H2 d. O2 19. On a severely cold night with the temperature below freezing point, a farmer, afraid that his fruit in the cellar will freeze, places a tub of water in the cellar. What do you think will happen? a. the water will probably freeze in the cellar before the fruit. b. the water, as it freezes, absorbs heat from the fruit in the cellar. c. the water, as it freezes, will give off heat to the fruit in the cellar. d. the farmer made a mistake since the water will ultimately chill the cellar. 20. which substance is most soluble in water? a. Cl2 C. HCI b. CO2 d. O2